如何用用c语言读文本自动修改第28到第30个字符。

Question

1.如何用用c语言读文本自动修改第28到第30个字符例如第一行2.5自动修改为0.1，以下各行第28到第30个字符自动加0.1，例如第二行是0.2
19650102082400 26.80 100.902.50999 0
19650103180000 27.00 100.803.20999 0
19650103184200 26.60 100.803.20999 0
19650107122800 28.30 102.303.20999 0
19650107191500 34.00 104.503.70999 0
19650110191600 27.27 101.322.70999 0
19650110195600 27.27 101.322.70999 0
19650110225200 27.27 101.322.70999 0
19650112123600 27.30 100.402.40999 0
19650114103100 26.00 98.402.50999 0
19650114172400 25.60 100.003.00999 0
19650115162400 26.80 102.802.90999 0
19650116073100 25.40 99.902.40999 0
19650117024700 29.00 103.303.40999 0
19650118024100 27.35 101.002.50999 0
19650119221200 33.50 100.804.00999 0
19650121070000 25.50 100.002.70999 0
19650121123600 25.00 99.173.40999 0
19650122192900 26.00 100.502.70999 0
19650123010000 25.72 102.202.70999 0
19650123122100 26.17 102.222.50999 0
19650123200000 26.17 102.222.50999 0
19650123205000 27.22 101.352.70999 0
19650123210000 27.20 101.303.20999 0

Answer 1

#include
#include
#define ERROR 0
void main()
{
FILE fp1, *fp2;
char * pStr;
int iClose;
pStr = (char *)malloc(sizeof(char));
/打开源文件*/
fp1 = fopen("F:\VSProjects\ConsoleApplication2\math.txt","r");
/*创建目标文件*/
fp2 = fopen("F:\VSProjects\ConsoleApplication2\mathbak.txt","w+");
if (NULL == fp1)
{
printf("Open File math.txt Failed......");
exit(-1);
}
if (NULL == fp2)
{
printf("Open File mathbak.txt Failed......");
exit(-1);
}
while (!feof(fp1))
{
if (fp1 == ERROR )
{
fclose(fp1);
fclose(fp2);
}
fgets(pStr, 100, fp1);
if (pStr[27] == '.')
{
if (pStr[28] == '9')
{
pStr[28] = '0';
pStr[26] = (char)((int)pStr[26] + 1);
}
else
{
pStr[28] = (char)((int)pStr[28] + 1);
}
}
else{
if (pStr[29] == '9')
{
pStr[29] = '0';
pStr[27] = (char)((int)pStr[27] + 1);
}
else
{
pStr[29] = (char)((int)pStr[29] + 1);
}
}
fputs(pStr, fp2);
}
fclose(fp1);
fclose(fp2);
system("pause");
}